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<p>The domain model, services and repository interfaces. This is
    the central part of the application. The ubiquitous language is used
    in classes, interfaces and method signatures, and every concept in
    here is familiar to a expert in the cargo shipping domain.</p>
<p>There is no infrastructure or user interface related code here,
    except for things like transactional, validation and security metadata which is
    likely to be relevant to a domain expert ("Either all of foo succeeds
    or none of it does", "In order to do bar you need to be a Supervisor",
    and so on).</p>
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